The wet kit for wet surfaces shiny but I would say it would stick with the normal kit the same way when they stick signs on vans they spray with water and it displaces when pushed down I will do a trial to see with the normal kit.
Part A neoprene part B pvc poly but I tried both on the vinyl both would do a temp repair.
Test kits are about £1.50 + post for a trial two patches, you can buy massive patches from the tear aid site. There are other applications tents swimming pools boat seats etc there clear patches so ideal for seats on ribs and stretch with the fabric.

all good David but the clam shell is a bit limited but a brilliant repair if unsightly we use them and leave on but you do have to make holes bigger in some cases.
the tear aid is good i used some on my rib a small scuff it was on for three years no sign of coming off plus being clear blends in.
go on the site and buy a test kit have a play worth seeing its performance.
i was going to do a wet trial but had a read of the underwater one and it works in the dry and wet but states non textured wet so just buy the underwater repair best of both worlds.
also the stuff gurnard has stuck on is worth a look at for floor repairs its got a bit more thickness to it.
so for a few quid it would have to be really drastic to stop you boating with a repair kit with all the bits mentioned.